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The physical design of Jason Voorhees has gone through changes, some subtle and some radical. The original design called for Jason to have hair, but Savini and his crew opted to make him bald, so he would look like a "hydrocephalic, mongoloid pinhead", with a dome-shaped head.
Thereof, what color is Jason Voorhees hair?
In appearance, Jason looks like very redneck or hillbilly, with hazel eyes, yellowish deformed teeth, long reddish-brown hair, a rustic beard and several bloated skull deformities on the right side of his face.
Beside above, why does Jason kill?
Jason, He was an almost completely silent, undead and seemingly unstoppable killing machine. Jason was an iconic madman who haunts Camp Crystal Lake and the surrounding area, driven to slaughter anyone he encounters by a burning need to avenge the death of his beloved mother, Pamela Voorhees.
According to IMDb, composer Harry Manfredini's film score is meant to sound like young Jason's voice saying "kill, kill, kill; mom, mom, mom," inspiring her to go on a killing spree. Manfredini created the effect by speaking the syllables "ki" and "ma" into a microphone running through a delay effect.